Feeling snubbed my younger sibling?

I feel like my parents just CARE more about my younger sister (who is 4 years younger than me). For example, they are WAY more into her sports than they were into mine... (they keep tallies of the score at her games, etc., and she is on rep teams, and I wasn't) and I swear they don't even know what courses I am taking at uni (this is my first year of uni). If she does something, ie. steal my clothes, they don't get mad at her at all... but if I make a slightly embaring joke at her expense in front of one of her friends, they get SO mad at me and say I'm being innapropriate. She gets away with pretty much everything because she's 4 years younger. I constantly feel like I'm being treated unfairly and they seem to think that I'm just being immature. I don't know if I'm secretly jealous of my little sister or something... but I feel like everything I do I get like punished for, and whenever she does something it's just fine.